If you go to a 30" arrow, jump up one spine number, if you go to a a 32" arrow, then
go up two spine numbers. Ditto for going shorter, 26" one spine down, 24" two
spines down.

Head weight will also affect spine, however, it will require 45-50 grains to jump one
spine number. For example, if you're shooting a 40# bow and using a 29" 1816 with
a 100 gr head, going to a 150 grain head may require you to jump to a 1916.

This WILL NOT give you the perfect aluminum arrow for a given bow. It will give you
a tunable arrow, and that's all you need for starters. Once the arrow is tuned, you'll
know if you're compensating for a stiff or soft arrow by the tuning requirements.
Then you can fine tune arrow choices by juggling wall thicknesses and diameters.

For example, if you have a #41 @ 28" bow and are using a 29" arrow, you'd pick an
1816, right? And that would work. If you find that you have to move the rest/strike
plate out a little more than you’d like, then your NEXT set of arrows might be 1914s.
They are the same weight as the 1816s, but a little stiffer.

Regarding Fastflight Fight (low mass/low stretch) strings. The difference between
Dacron and FF is on the order of 5#, in a worst case scenario, so if the right arrow
was chosen in the first place, it should still be within tunable parameters.

In addition, if I know a particular bow, I might suggest an arrow that's not one of the
primary spine numbers. A certain #57 bow might work very well with a 2114, for
example.

*Aluminum arrow nomenclature: the first two numbers denotes the shaft diameter in
1/64" and the second two are the wall thickness in 1/1000". For example, a 2016
has a 20/64" (or 5/16") diameter and a wall thickness of 16/1000".

For those of you who would like more detailed information,
below is a table complied from Easton's aluminum arrow
charts, showing the name, spine, weight and grains per inch
for each arrow size.

To convert the spine (deflection in inches) to approximate
draw weight, divide 28 by the deflection.

For example, an 1816 has a deflection of 0.756", therefore: 28/0.756 = ~37#, the midpoint of an 1816's
acceptable weight range.

Note that Easton does change their offerings from time to
time, and therefore some entries may no longer be available
and some new additions may not be listed.

Shaft

Spine Size (inches)

Weight (grains)

Weight (gr/in)

1214

2.501

142 - 24"

5.92

1413

2.036

153 - 26"

5.88

1416

1.684

194 - 27"

7.19

1512

1.554

157 - 27"

5.81

1514

1.370

184 - 27"

6.81

1516

1.403

197 - 27"

7.30

1612

1.298

170 - 27"

6.30

1614

1.153

208 - 27"

7.70

1616

1.079

227 - 27"

8.41

1712

1.099

181 - 27"

6.70

1713

1.044

200 - 27"

7.41

1714

0.963

219 - 27"

8.11

1716

0.880

261 - 29"

9.00

1813

0.874

228

7.86

1814

0.799

249

8.57

1816

0.756

269

9.28

1912

0.776

220

7.59

1913

0.733

242

8.34

1914

0.658

269

9.28

1916

0.623

291

10.03

2012

0.680

232

8.35

2013

0.610

261

9.00

2014

0.579

277

9.55

2016

0.531

306

10.55

2018

0.464

356

12.28

2020

0.426

391

13.48

2112

0.590

244

8.41

2113

0.540

270

9.31

2114

0.510

286

9.86

2115

0.461

312

10.76

2117

0.400

349

12.03

2212

0.505

256

8.83

2213

0.460

285

9.93

2214

0.430

302

10.41

2215

0.420

309

10.66

2216

0.375

349

12.03

2219

0.337

399

13.76

2311

0.450

242

8.36

2312

0.423

275

9.48

2314

0.390

309

10.66

2315

0.340

338

11.66

2317

0.297

385

13.28

2412

0.402

280

9.66

2413

0.365

302

10.41

2419

0.268

422

14.56

2511

0.348

233

8.1

2512

0.321

298

10.28

2514

0.305

329

11.34

2612

0.285

280

9.68

2613

0.265

333

11.48

2712

0.260

275

9.5

The 2007 Easton catalog introduced a new version of their Gamegetter XX75 shafts.
Now sporting a black anodized finish, the shafts are available in four sizes,
based on their carbon arrow nomenclature. In 2009, the XX78 Superslam (digital)
shafts were given a shaft diameter nomenclature as well.

Essentially, a 500 series shaft is identical to a 2016,
400 = 2117,
340 = 2315, and
300 = 2317.